<?php
/*
 *  $Id: Complex.php 7490 2010-03-29 19:53:27Z jwage $
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 *
 * This software consists of voluntary contributions made by many individuals
 * and is licensed under the LGPL. For more information, see
 * <http://www.doctrine-project.org>.
 */

/**
 * Doctrine_Hook_Parser_Complex
 *
 * @package     Doctrine
 * @subpackage  Hook
 * @license     http://www.opensource.org/licenses/lgpl-license.php LGPL
 * @link        www.doctrine-project.org
 * @since       1.0
 * @version     $Revision: 7490 $
 * @author      Konsta Vesterinen <kvesteri@cc.hut.fi>
 */
abstract class Doctrine_Hook_Parser_Complex extends Doctrine_Hook_Parser
{
	protected $_tokenizer;

	/**
	 * Constructor.
	 */
	public function __construct()
	{
		$this->_tokenizer = new Doctrine_Query_Tokenizer();
	}

	/**
	 * parse
	 * Parses given field and field value to DQL condition
	 * and parameters. This method should always return
	 * prepared statement conditions (conditions that use
	 * placeholders instead of literal values).
	 *
	 * @param string $alias     component alias
	 * @param string $field     the field name
	 * @param mixed $value      the value of the field
	 * @return void
	 */
	public function parse($alias, $field, $value)
	{
		$this->condition = $this->parseClause($alias, $field, $value);
	}

	/**
	 * parseClause
	 *
	 * @param string $alias     component alias
	 * @param string $field     the field name
	 * @param mixed $value      the value of the field
	 * @return void
	 */
	public function parseClause($alias, $field, $value)
	{
		$parts = $this->_tokenizer->quoteExplode($value, ' AND ');

		if (count($parts) > 1) {
			$ret = array();
			foreach ($parts as $part) {
				$ret[] = $this->parseSingle($alias, $field, $part);
			}

			$r = implode(' AND ', $ret);
		} else {
			$parts = $this->_tokenizer->quoteExplode($value, ' OR ');
			if (count($parts) > 1) {
				$ret = array();
				foreach ($parts as $part) {
					$ret[] = $this->parseClause($alias, $field, $part);
				}

				$r = implode(' OR ', $ret);
			} else {
				$ret = $this->parseSingle($alias, $field, $parts[0]);
				return $ret;
			}
		}
		return '(' . $r . ')';
	}

	/**
	 * parseSingle
	 *
	 * @param string $alias     component alias
	 * @param string $field     the field name
	 * @param mixed $value      the value of the field
	 * @return void
	 */
	abstract public function parseSingle($alias, $field, $value);
}